3M Weatherban ribbon sealants PF 5422 and PF 5423 are a supported synthetic rubber sealant in ribbon form. They offer a watertight, gasket like seal in applications such as bedding glass, around window and door frames, etc. They can also act as a metal seam sealer in overlap seams, building panels, rain gutters, and can be used in conjunction with mechanical fasteners. They offer outstanding resistance to weathering, and develops good adhesion to glass, metal, and most other surfaces.